Is there a common link RR window & sunroof?

[BrierS]

My '87 300TD has an occassional glitch with what appears to be both the RR window and the sunroof. I just received my CD and can not yet tell from the schematic if there is a point where these two systems converge. If I am reading it correctly, both motors reverse direction and body/earth grounds change with the current flow directed by the switches. ???

My sunroof is about 1/2 open now and the window is closed. Attempting to activate either switch does not produce an electrical load. The other interesting quirk is that an hour or possibly sometime tomorrow both will work again (for awhile).

Help please.